von hefner-alteneck



(No Model.) 2 Sheets-Sheet 1.

P. VON HEFNER-ALTENEOK & O. HOFFMANN. DYNAMO ELECTRIC MACHINERY.

Patented Dec. 25, 1888.

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(No Model.) 2 SheetsSheet 2.

P. VON H-EPNER-ALTENE OK & G. HOPFMANN. DYNAMO ELECTRIC MACHINERY.

No. 395,019. Patented Dec. 25, 1888.

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UNITED STATES PATENT QEricE.

FRIEDRICH VON IIEFNER-AL'IENECK AND ARI. II( )IFI\L-\NI\ ()l" BERLIN, GERMANY, ASSIGXORS TO SIEMENS & I'lALbKE, OF SAME ILALE.

DYNAMO-ELECTFHC MACHINERY.

SPECIFICATION forming part of Letters Patent No. 395,019, dated December :25, 1888.

Application filed May 28, 1887. Serial No. 239,674. (No model.)

To all whom it may concern:

Be it known that we, FRIEDRICH voNIIEE- l nER-ALTENEcK, a subject of the King of Bavaria, and CARL IIOFFMANN, a subject of the King of Prussia, both residing at Berlin, in the German. Empire, have invented certain new and useful Improvements in Dynamo Electric Machines and their Combination with Motors, of which the following a speciiication.

Our invention has for its object to provide a new and simplified construction in dynamoelectric machines, and in their combination l with motors 3 and it consists in so constructing the same that the intensity of the current generated thereby is increased and the number of parts connecting the dynamo and the 1 motor lessened.

Referring to the accompanying drawings, in which corresponding parts are designated by similarletters,Figure 1 is a vertical longitudinal section of a dynamo-electric machine constructed accordingto our invent-ion. Fig. 2 is a vertical cross-section on the line LL .r of i Fig. 1. Fig. 3 is a vertical section on the line y y of Fig. 1; and Fig. l is :1 side view, partly in section, of a dynamo coupled with i a motor.

The circular armature A, which is of the type known as the Pacinotti ririg-armature, is connected by means of the spokes B and hub D with the shaft C,-and rotates therewith, while the shaft itself is carried upon suitable bearings, F 1*. Upon one ljiearing are mounted suitable collectors, G, for taking the generated electricityfrom off the rotating armature, while upon the other support are mounted two or more electro-nmgnets, E, the said magnets uniting at the center, through which is a perforation, I. may or may not be provided with pole extensions or pieces P, and are so constructed that they fitinto the ring-armature as snugly. as possible. The shaft C extends through the perforation I, but does not touch the magnets. One end of the shaft 0 maybe provided with a wheel, adapted to receive a belt, by which motion may be communicated to it. 1

Instead of thus providing the shaft with a wheel, to connect it with the motor, the shaft thereto by screws or bolts 5.

The said magnets I may be common to both the dynamo and the motor, in which case the stationary field-magnets E are fastened to the non-moving parts of the motor, which also receive a bearing for the shaft. The magnets maybe fastened to the said parts of the motor either by being cast integral therewith or being fastened In this case I prefer to do away with the outer bearing or support, F, hereinbefore described, though it may still be used when it desirable to give great solidity to the machine and shove the hub D, carrying the armature, upon the free projecting end of the shaft where it is se 1 cured by means of the nut S, while the col- 1 h ctors G are carried upon a bracket, II, projecting from and ftlfil'fllttl to the mar-moving parts of the motor.

The advantages of the constrm-tion are numerous: among others, that nearly all the magnetic lines of force issuing from the exciting-poles are cut by the wires of the rotating armature, and, hence, all the magnetism generated in the magnets may be utilized; that the polepieces require but very short connecting parts, so that the injurious resist ance of the transmission of magnetism in 1 these connecting parts is reduced to a minimum; that all magnetic lines of force be- ,also upon the position of the compassneedle; that when combined with the motor, as shown, there is a colisiderablc saving of expense and space in consequence of the removal of one of the bearings for lllc shaft, as well as of a part or whole of the baseplate for the dynamo; and that, as shown in Fig. -l, the armature may be drawn off the g shaft without necessitating the disnnninting of a journal-box.

Having now described our invention, what we claim, and desire to secure by Letters Patent, is

1. In a dynamo-electric machine, the combination of a revolving ring-armature mounted upon a shaft,-bearings for the said shaft, stationary magnets supported thereoninciosing the said shaft and inolosed by the armature, substantiaity as and for the purpose described.

2. The combination of a ret'oiving ring-armature mounted upon a shaft, a motor, and

i i i magnets fastened to the non-moving parts IO thereof surrounding the said shaft and ineiosed by the said armature, substantially as and for the purpose described.

FRIEDRICH VON HEFNER-ALTENEGK. CARL HOFFMANN. Witnesses:

B. R01, F. VON VERsEN. 

